Malicious PDF — malware analysis report

Static analysis result for SHA-256 f476a73297c663bd…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 17:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 486a295ad6ac1ad8fb6f8407c90e8140 SHA-1: 5c607e4b216de741113c56d74858e2709fdb351c SHA-256: f476a73297c663bd4b14e2baf69f446e81a9b7ac67ea01e44459879e183220e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dep14kirov.ru/userfiles/file/jerejate.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chdfte4cr15sa4ihvs78m0e940/54197051901.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nipatadifebukuku.pdfIn PDF document text
    • http://hrudolf.com/userfiles/23778627837.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/35f6lp96h3mt96rujs3ncthb96/zovemifamubom.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/gogiwujosirogejakukaz.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210924180250.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/eabd99c9156b66be18ab59cedd861807/zumepinigoxoloriw.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/35500981866.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/madepiw.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/bejetisitote.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/5053999291.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bokaxuxetakurobopisuza.pdfIn PDF document text
    • http://skia22.ru/pic/file/duteban.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/52548564207.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35051531632.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/94106954225.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/zozubomutisokinenu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/sufenowavesufejabavob.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/94900299373.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/44366796976.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/wolare.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/98480307549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=periodic+table+of+elements+group+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 15552 bytes
SHA-256: 72a0fcd1cd8c75ad907e090726e5c44a2462d4fdb7a4e664683ebf181f85ee93
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 11324 bytes
SHA-256: 66d64877df3c18c516fe21bc10efa802d8b13c4b2ee5d8df52719b2024c90fd2
font_02_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1